Heart diseases and sleep disturbances interact with one another in a reciprocal and complicated way. In a classic study of Finnish adult men, Partinen and coworkers found a higher prevalence of coronary heart diseases in men who slept less than six hours per night after adjustment for age, sleep quality, use of sleeping pills and tranquilizers, smoking, alcohol use, Type A score, neuroticism, use of cardiovascular drugs, and history of hypertension. Difficulty in falling asleep at bedtime has been found to be associated with a two-fold increase in the risk of myocardial infarction during a follow-up period of 4.2 years (Appels and Schoulten, 1991). Further, among patients with myocardial infarction in another study, almost half had had sleep disorders during the six months immediately preceding the onset, which is a higher proportion than in a comparable population without myocardial infarction (Carney et al., 1990).
Waking up in the night precedes more often than follows an angina pectoris attack. Most of these nocturnal awakenings are accompanied by getting up for visits to the toilet, and angina pectoris at night often occurs in connection with getting out of bed for micturition (Asplund, 2004).
Windows open more often -Easier to fall asleep -Fewer awakenings Better sleep quality Less tired in the morning
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